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Chen, Y., Jackson, D. A., & Harvey, H. H. (1992). A comparison of von Bertalanffy and polynomial functions in modelling fish growth data (Vol. 49).
Zusammenfassung: We compared the von Bertalanffy growth function (VBGF) and five polynormial functions (PF) in modelling fish growth for 16 populations comprising six species of freshwater fishes. Ranked results of the variance explained by each growth function indicated that VBGF described growth data better than three- and four-parameter polynomial functions. Log-transforming length and age greatly improved the goodness-of-fit of the three-parameter polynomial function. Statistical comparison of growth between populations or sexes was done using a general linear model for polynomial functions. The VBGF proved to be the best growth model for all 16 populations.
Schlüsselwörter: Fischerei, wachstum, methode, theorie, modell, statistik
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Geldhauser, F. (1992). Die kontrollierte Vermehrung des Schlammpeitzgers (Misgurnus fosssilis L.) (Vol. 43).
Zusammenfassung: (Dbo).
Schlüsselwörter: Fischerei, Reife, Wachstum, Methode, Misgurnus fossilis, Schlammpeitzger, Fisch
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Talbot, A. J., & Doyle, R. W. (1992). Statistical Interrelation of Length, Growth, and Scale Circulus Spacing: Use of Ossification to Detect Nongrowing Fish (Vol. 49).
Schlüsselwörter: Fisch, wachstum, methode, statistik
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Mulligan, T. J., & Leaman, B. M. (1992). Length-at-Age Analysis: Can you Get What You See? (Vol. 49).
Schlüsselwörter: Fisch, lÄngenfrequenz, statistik, methode, wachstum
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Schnute, J. T. (1992). Statistical Analysis of Embedded Replicates in Mark-Recovery Experiments (Vol. 49).
Schlüsselwörter: Fisch, statistik, capt-recapt, methode
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Terceiro, M., Fournier, D. A., & Sibert, J. R. (1992). Comparative Performance of MULTIFAN and Shepherd_s Length Composition Analysis (SRLCA) on Simulated Length-Frequency Distributions (Vol. 121).
Zusammenfassung: The authors simulated length-frequency distributions for 3-, 7-, and 13-age-class exploited populations (Peprilus triacanthus, Gadus morhua, Paralichthys dentatus, Pomatomus saltatrix ) to compare the performance of Shepherd's length composition analysis (SRLCA) and MULTIFAN in resolving the distributions to age frequencies. The length distributions were characterized by von Bertalanffy growth, variable recruitment, variable mortality, partial selectivity of fishing gear for the youngest age-groups, and a length-dependent trend in the standard deviation in length at age. Comparative performance of SRLCA and MULTIFAN was assessed quantitatively by using the Kolmogorov-Smirnov cumulative distribution test to compare calculated proportions at age with the simulated values. Shepherd's analysis provided a good return for the amount of computational resources invested, with limited subjective user input. In contrast, MULTIFAN offered a much more complex but powerful estimation technique, and performed consistently better than SRLCA in matching the simulated proportions at age.
Schlüsselwörter: Statistik, modell, lÄngenfrequenz, wachstum
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Akamine, T., Kishino, H., & Hiramatsu, K. (1992). Non-biased interval estimation of Leslie's removal method.
Zusammenfassung: Leslie's removal method, which is used to estimate the initial population size and the removal ratio simultaneously, is modeled in terms of the product of binomial distributions. The approximation of these binomial distributions to the standard normal distribution presents a new method which has no bias for estimators. This is an improvement over the maximum likelihood method and the likelihood ratio test, and is essentially equivalent to a standard goodness-of-fit test. The confidence region on the 2-dimensional plane defined by the initial population size and the removal ratio gives each confidence interval. This region is defined by the chi-square distribution with 2 degrees of freedom.
Schlüsselwörter: Fisch, statistik, modell, binominal, population, basic, listing
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Akamine, T., & Matsumiya, Y. (1992). Mathematical analysis of age-length key method for estimating age composition from length composition.
Zusammenfassung: In mathematics, the age-length key method is an estimating method for the ratio of each distribution in a mixture of distributions. Although the maximum likelihood method is the principle of this estimation, this model is a nonlinear model with a restrictive condition. At first, Hasselblad solved this model by using a new iteration method with a computer. Although his method was regarded as the steepest descent method or EM algorithm, it is proved to be an application of Lagrange's indeterminate multiplier method to the iteration method. Nowadays, there are other useful algorithms of optimization, especially Marquardt's method, for this estimation.
Schlüsselwörter: Fisch, statistik, normalverteilung, lÄngenfrequenz, theorie, methode
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Körner, R. (1992). Die Helme im Jahr 1979 und ihre Fische. Veröff. Spengler-Museum-Sangerhausen, 6, 47?51.
Schlüsselwörter: Fisch, Vorkommen, regional
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Kovacek-Mann. (1992). Vergleichende populationsdynamische Untersuchungen von Barbe (Barbus barbus, L. 1758) und Rußnase (Vimba vimba, L. 1758) im Donaustauraum Altenwörth und der angrenzenden Fließstrecke in der Wachau unter besonderer Berücksichtigung der Ernährungsbiologie. Doctoral thesis, Universität Wien, Wien.
Schlüsselwörter: Fisch, Barbe, Rußnase, Nahrung, Ernährung, Biologie
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